Nana, an English teacher at a certain school, harbored a secret she could never reveal to her students—the existence of her husband Kotaro, twelve years her junior. Originally acquainted through their parents, Nana and Kotaro had been separated two years prior when he moved to the United States. There, Kotaro achieved remarkable success as an entrepreneur. Upon returning to Japan, he married Nana and enrolled in the very school where she taught. However, Kotaro struggled to adapt to the Japanese school environment, leaving Nana torn over how to navigate their complicated relationship. This story unfolds the quiet romance and domestic tensions hidden within their everyday lives.